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-   RC Radios, Transmitters, Receivers, Servos, gyros (https://www.rcuniverse.com/forum/rc-radios-transmitters-receivers-servos-gyros-157/)
-   -   rx and tx frequency changes? (https://www.rcuniverse.com/forum/rc-radios-transmitters-receivers-servos-gyros-157/1401232-rx-tx-frequency-changes.html)

ve7dpg 01-04-2004 02:14 PM

rx and tx frequency changes?
 
Okay I have a question since I have been a ham and we change crystals in a radio it is always necessary to net the crystal to the desired frequency, no two crystals will oscillate at exactly the same frequency. but then we get to this hobby and they are promoting plug and pray technology. I don't understand, I just bought a hitec flight pack which comes with no crystal, you order the crystal for the desired frequency you install the crystal and it's supposed to be on frequency??

thanks for some insight in this matter. Warren Kean [email protected]

JNorton 01-04-2004 05:02 PM

RE: rx and tx frequency changes?
 
I see your question. However we are dealing with FM, not SSB which has to be within a few hundred hertz to sound intelligible. The 10KHz FM signal will be on frequency with the crystal without any tuning.
John

ve7dpg 01-04-2004 05:21 PM

RE: rx and tx frequency changes?
 
;)

well i guess but I was talking about FM not to many repeaters use SSB upper or lower!


73 Warren

JNorton 01-04-2004 09:22 PM

RE: rx and tx frequency changes?
 
Sorry, I'm dating myself. Don't worry about it. The crystal provide enough frequency stability. :)

strato911 01-08-2004 10:36 PM

RE: rx and tx frequency changes?
 

ORIGINAL: ve7dpg

But then we get to this hobby and they are promoting plug and pray technology.
Just remember that this is only for the receiver. In North America it is illegal to swap the crystal in the transmitter unless you are using Ham frequencies (and have a Ham license as you mentioned you have), or if it is checked and retuned if necessary by a licensed tech.

However, you will encounter MANY users who believe these laws don't apply to them. Please ignore them.


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